Q.90
Identify the correct sequence of the following events in order of their discovery! proposed theory (year wise)
(A) . Path coefficient analysis
(B) . Variance estimation by Henderson
(C) . Most probable producing ability
(D) . X-ray crytallography
Choose the correct answer from the options given below:
- Chronological Sequence of Discoveries:
- Path Coefficient Analysis (1921): Formulated by Sewall Wright to model causal networks, correlation, and inbreeding in quantitative genetics.
- Most Probable Producing Ability - MPPA (1937–1945): Developed by Jay L. Lush (the father of modern animal breeding) for repeated records (e.g., milk yield across lactations) based on repeatability ($r$):
$$\text{MPPA} = \mu + \frac{n r}{1 + (n - 1)r} (\bar{P} - \mu)$$ - Henderson's Methods of Variance Component Estimation (1953): C. R. Henderson published his groundbreaking paper on Methods I, II, and III for estimating variance and covariance components in non-orthogonal, unbalanced mixed models.
- X-ray Crystallography of DNA (1953): Rosalind Franklin and Maurice Wilkins obtained Photograph 51, leading to Watson and Crick's DNA double helix model published in Nature in April 1953.
- Correct Chronological Sequence: (A) $\to$ (C) $\to$ (B) $\to$ (D).
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